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/* $NetBSD: elink.c,v 1.7 1995/01/29 07:36:56 cgd Exp $ */
/*
* Copyright (c) 1994, 1995 Charles Hannum. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Charles Hannum.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Common code for dealing with 3COM ethernet cards.
*/
#include <sys/types.h>
#include <machine/pio.h>
#include <dev/isa/elink.h>
/*
* Issue a `global reset' to all cards, and reset the ID state machines. We
* have to be careful to do the global reset only once during autoconfig, to
* prevent resetting boards that have already been configured.
*/
void
elink_reset()
{
static int x = 0;
if (x == 0) {
x = 1;
outb(ELINK_ID_PORT, ELINK_RESET);
}
outb(ELINK_ID_PORT, 0x00);
outb(ELINK_ID_PORT, 0x00);
}
/*
* The `ID sequence' is really just snapshots of an 8-bit CRC register as 0
* bits are shifted in. Different board types use different polynomials.
*/
void
elink_idseq(p)
register u_char p;
{
register int i;
register u_char c;
c = 0xff;
for (i = 255; i; i--) {
outb(ELINK_ID_PORT, c);
if (c & 0x80) {
c <<= 1;
c ^= p;
} else
c <<= 1;
}
}
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